I agree with both of you. 
It’s great that DefOS is a module that you only add in if you need it. Plus, mobile and web projects especially need to keep the size down.
But . . .
To be honest I don’t like ^ this ^ very much (no offense, Britzl). The things that DefOS does (and more) are pretty much essential for any desktop project. The current built-in desktop support is so limited, I really don’t think it’s possible to make a desktop game without an extension—at least not a polished and professional one.
This could be a long discussion, but anyway, I still hope for full, official support for desktop. Defold would be ideal for desktop games, if only it had these features! People won’t choose an engine unless it already provides the things they need. (like this guy)